00:01
Okay, here we draw a ben diagram.
00:04
So let's do it to start down here.
00:07
Here is everybody, what you.
00:12
Let's have here breakfast, here lunch, and here dinner.
00:21
So, eld, breakfast, lunch, dinner.
00:25
Now, if you can with ben diagrams, always start in the middle.
00:29
So how many students enter three? well, luckily they tell you that here.
00:34
10 at all 3.
00:36
I know 10 goes in here.
00:40
Now, 400 at breakfast.
00:43
That 400 goes here, here, here and here.
00:48
Those four dots make out a total of 400.
00:52
Therefore, what we do is we put a 400 by the breakfast sign b in brackets to indicate it means these areas, a whole circle, in effect.
01:09
We are told that lunch was 250.
01:13
So we put 250 in brackets by the l to indicate the four areas here add up to give me 250.
01:25
Now, dinner is 425.
01:29
So this goes down here, 425.
01:32
And again, the four areas of circle d add to give me 425.
01:39
Now we're told 80.
01:41
Let's do this one here.
01:44
80 at dinner but not breakfast or lunch which means then you have to have 80 here that's where you have students eating dinner but not the rl they can't be here they can't be here they can't be here they did not eat breakfast or lunch so there must be all in that section then we're told here the hard part 70 at breakfast and lunch.
02:25
What you don't do is put 70 here.
02:28
That's the most common mistake made.
02:30
That is incorrect.
02:32
Breakfast and lunch is going to be like this.
02:36
Here is breakfast.
02:38
Here is lunch...